/**
* Created with IntelliJ IDEA.
* Description:
* User: ${USER}
* Date: ${YEAR}-${MONTH}-${DAY}
* Time: ${TIME}
*/
public class Main {
    public static void main(String[] args) {
        MyStack myStack = new MyStack();
        myStack.push(12);
        myStack.push(23);
        myStack.push(34);
        myStack.push(45);
        myStack.pop();
        myStack.pop();
        myStack.pop();
        System.out.println(myStack.top());
    }
}